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Differential regulation of steroid nuclear receptor coregulator expression between normal and neoplastic prostate

Hannelore V Heemers1, Lucy J Schmidt, Emily Kidd

  • 1Department of Urology Research/Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota 55905, USA. heemers.hannelore@mayo.edu

The Prostate
|February 19, 2010
PubMed
Abstract

Insights

Prostate cancer (PCa) progression is linked to androgen receptor (AR) action. Targeting AR coregulators, which are regulated differently in cancer versus normal cells, offers a potential therapeutic strategy for PCa.

Area of Science:

  • Oncology
  • Molecular Biology
  • Endocrinology

Background:

  • Androgen receptor (AR) signaling is crucial for prostate cancer (PCa) development and progression.
  • Aberrant expression of AR-associated coregulators significantly impacts AR activity in PCa.
  • Understanding coregulator expression mechanisms in PCa is key for developing novel therapeutic strategies targeting AR activity.

Purpose of the Study:

  • To investigate the differential regulation of core coactivators (SRC1, SRC2, SRC3, CBP, p300) by androgens in prostate cancer cells versus non-malignant prostate cells.
  • To explore the impact of androgen stimulation and deprivation on the expression of key AR coregulators in various preclinical models.

Main Methods:

  • Utilized multiple prostate cancer cell lines and xenograft models.
  • Employed non-malignant prostate epithelial cell lines and androgen-responsive tissues from a Wistar rat model.
  • Assessed the expression of SRC1, SRC2, SRC3, CBP, and p300 under conditions of androgen stimulation and deprivation.

Main Results:

  • Androgen stimulation decreased the expression of SRC1, SRC2, SRC3, CBP, and p300 in PCa models.
  • Androgen deprivation increased the expression of these core coactivators in PCa models.
  • In contrast, these coregulators' expression remained largely unchanged in AR-positive non-malignant prostate cells and tissues.

Conclusions:

  • Demonstrated distinct regulation patterns of coregulator expression between neoplastic and normal prostate cells.
  • Highlighted the therapeutic potential of targeting the regulatory mechanisms of coregulator expression for PCa intervention.

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